I can see a new revenue opportunity for Ryanair where they allow passengers to bid on whether a seat is/is not reclinable. This new product would permit the guy behind to block the guy in front from reclining by paying more, or the guy in front could pay more to regain this privilege.
There would be great possibilities for a real-time booking app feature and the nervous tension as the check-in window begins to close as you attempt to get one last closing bid in ...
Another marvelous opportunity to turn inconvenience for some into more profits and cheaper flights for others.